Detachable telescope sight mount



R.'R. HARDGROVE ET AL 2,649,779

DETACHABLE TELESCOPE SIGHT MOUNT Aug. 25, 1953 2 Sheets-Sheet 1 Filed Jan. 7, 1953 INVENTORS B0 1-ZRH2 7229 r0 1/3 (E Er 72652 TLa k e .9 2 r/fzi'g.

1953 R. R. HARDGROVE ET AL 2,549,779

DETACHABLE TELESCOPE SIGHT MOUNT Filed Jan. "I, 1955 2 Sheets-Sheet 2 of one of the mounting brackets shown spaced therefrom, 1f; H .7 I

Patented Aug. 25, 1953 DETACHABLE TELESCOPE SIGHT MOUNT Robert R. Hardgrove and Ernest '1'. Lake, Livingston, Mont.

Application January 7, 1953, Serial No. 330,042

6 Claims. 1 V

This invention relates to a telescope sight mount for firearms and more particularly to a mount which may be readily secured to space portions of the barrel or tube of a telescope sight for detachably mounting a telescope sight on a firearm and with the axis of the telescope si properly disposed relatively to the axis of the firearm barrel for accurately sighting the firearm through the telescope sight.

More particularly, it is an aim of the present invention to provide a novel supporting connection between adaptor means which are secured to the firearm and mounting elements which are secured to the telescope sight to insure correct alignment and maximum stability between the detachably connected parts.

Another object of the invention is to provide a telescope sight mounting which may be readily locked nondetachably to prevent removal of the telescope sight from a firearm until the locking means of the mounting is released.

A further object of the invention is to provide a mounting of extremely simple construction which may be very economically manufactured and sold, which will be extremely efficient and durable, and which may be readily attached to a firearm and telescope sight for mounting the telescope sight on the firearm.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating a presently preferred embodiment thereof, and wherein:

Figure 1 is a side elevational view showing the mounting in an applied position and demountably supporting a telescope sight on a portion of a firearm;

Figure 2 is a longitudinal sectional view taken substantially along a plane as indicated by the line 22 of Figure 1 and showing the sight mounting in bottom plan;

Figures 3 and 4 are cross sectional views of the end portions of the mounting taken substantially along planes as indicated by the lines 3-3 and 44, respectively, of Figure 1;

Figure 5 is a longitudinal substantiallycentral sectional view partly in side elevation of the mounting shown in an applied position;

Figure 6 is an enlarged horizontal sectional view taken substantially along a plane as indi-* cated by the line 66 of Figure 1, and

Figure '7 is a fragmentary end elevational view of one of the adaptor bases and a portion Referring more specifically to the drawings, a portion of a conventional firearm such as a ifle is illustrated in the drawings and designated generally I0 and includes a receiver portion H. The detachable telescope sight mount, designated generally I2, and comprising the invention, includes a pair of adaptors l3 and It, each of which comprises a base or block having a recessed underside I5 adapted to conformably fit on a portion of the upper surface of the receiver H or which could engage upon the upper surface of the barrel l6 of a particular fi earm where the barrel is extended rearwardly a sufficient distance. lhe adaptors or blocks I8 and IQ are detachably secured on the receiver ll each by a pair of screw fastenings I! which extend loosely therethrough and which are threadedly anchored in the receiver II. The blocks or adaptors I3 and I4 have substantially flat top surfaces I8 in which are formed grooves I9 and 2B. The grooves I9 and 20 are disposed parallel to one another and to the axis of the firearm I0 and are disposed adjacent the side edges of the adaptors I 3 and I' l. Said grooves extend from the front end to the rear end of each adaptor and the groove I9 is of substantially V-shaped cross section, as best illustrated in Figure 7, while the groove 20 has a substantially fiat bed and upwardly and outwardly inclined side walls, for a purpose that Will hereinafter become apparent. The recessed undersides I5 of the adaptors l3 and hi intermediate of the side edges of said adaptors and at their adjacent ends, are provided with upwardly and outwardly beveled portions forming inclined hook engaging keeper portions 2 I.

The mounting [2 includes a front mounting bracket, designated generally 22 formed of similar clamp sections 23 and 24, as best seen in Figure 3, having opposed intermediate recessed portions 25 which substantially engage around a portion of the barrel of a telescope sight 26. A hook shank 2'! is interposed snugly between the bottom portions of the sections 23 and 24 and is located directly beneath and longitudinally of the telescope sight 26. The sections 23 and 24 have aligned bores 23a and 24a which align with transverse bores 21a of the hook shank 27. Headed screw fastenings 28 extend turnably through the bores 24a and 21a and threadedly engage the bores 23a for securing the sections 23 and 24 together beneath the sight 26 and with the hook shank 21. secured between the bottom portions of said sections. The upper portion of the section '24 isprovided with transverse bores 3 24b in which the headed ends of fastenings 29 are turnably countersunk and which fastenings 29 threadedly engage transverse bores 23b of the section 23 for drawing the upper portions of said mounting bracket sections together for clamping a part of the telescope sight 2B in said mounting bracket. The mounting bracket sections 23 and. 24 have substantially fiat bottom surfaces which are provided with ribs 30 and 3| which extend longitudinally of the telescope sight 26 and which are spaced apart a proper distance by the shank 21 to fit the grooves l9 and of the front adaptor l3. The ribs 30 and 3| in cross section each define downwardly and inwardly inclined side walls and a fiat bottom surface. The side walls of the ribs 30 contact the side walls of the V groove I?) but the flat bottom of said rib 3B is spaced from the bed of the V-shaped rib H3. The flat bottom of the rib 3| contacts the flat bed of the groove 23 and a slight space exists between the side walls of the rib 3| and the side walls of saidgroove 20. The hook shank 2'! extends rearwardly from the mounting bracket 22, as best seen in Figure 5, and has a longitudinally extending recess 32 which opens outwardly of its rear end. The hook shank 21 has a depending rear portion provided with a downwardly and forwardly inclined forward end forming a hook 33 the face of whch conformably fits against the keeper face 2| of theadaptor l3 and which inclined abutting'faces tend to cam the hook and mounting bracket downwardly for properly seating the ribs 30 and 3| in the grooves l9 and 20.

A rear mounting bracket '34 of one piece construction having a divided upper part 35 is recessed to define a bore 36 ,whichfits around another part of the telescopesight 26. A fastening 3? engagesan unthreaded bore.38 and a threaded boreBtaof thed ivided'upper part 35 for drawing said parts together :to restrict the bore 36 for clamping the rear mounting bracket 34 around the telescope sight 26. The flat bottom surface of the mounting bracket .34v isprovided with ribs 39 and 48 corresponding tothe ribs 3|! and 3 I, respectively, and which engage the grooves I9 and 26 of the rear adaptor M, respectively, in the same manner that the ribs 30 and 3| engage the :grooves l9 and 12:0 of the front adaptor I23, and'as previously described.

A rod lil has :a forward end seated in therearwardly opening recess 32 and has a portion adjacent its opposite rear end extending slidably through a bore 42 formed in thelbottomspart of the mounting bracket"34 and directly beneath the axis of the telescope sight 26. A'setscrew 43..is threaded transversely into'the' mounting bracket 34 for adjustably securin the rod 4| thereto. A hook 44 has a bore 45 extending longitudinally through the upper part thereof and in which the rod 4| is slidably received for s-lidably mounting said hook 44' on the rod -4| between the mounting brackets '22 and 34. The hook 44 is provided with a downwardly and rearwardly inclined hook face 45 which engages against the face2| of the block it. An expansion coil spring '41 is disposed on the rod 4| between the hook shank 2'! and the hook 44 and urges the hook -44 rearwardly so that the two hook faces 33 and/46 are named downwardly :by the keeper faces 2| to retain the ribs tilandB-B and the ribs 3-|-and:40'in engagement with the grooves IB and 20, respectively.

The hook 44 .is provided with a laterally extendin apertured ear 48 through which .the shank of a headed screw 49 loosely rextends. The

bore of the mounting bracket 34 so that the screw extends from said mounting bracket toward the mounting bracket 22. A locking nut 5| is threadedly mounted on the screw 49 between the ear 48 and the head of said screw. It will be readily apparent that the screw 49 together with the ear 48 will effectively function to prevent the hook 44 from turning on the rod 4|.

By turning the nut 5| to displace it away from the ear 48 and 'toward the head of the screw 49, the mounting I2 is unlocked so that by exerting a rearward pressure thereon or on the telescope sight 26, the rod 4| will be displaced rearwardly through the hook 44 so that the front hook 33 can be disengaged from the adaptor I3 and the front part of the mounting rocked upwardly. The rear hook 44 may then be readily disengaged from the rear adaptor I4. By reversing this procedure and engaging the rear hook face 45 with the keeper surface 2| of the rear adaptor l4, the other parts may be displaced rearwardly relatively to the hook 44 by a rearward pressure thereon and which will cause the rod 4| to slide through the hook 44 until the hook face 33 can be displaced downwardly behind the keeper face 2| of the front adaptor |3. The spring 41 will then displace the parts forwardly and engagesaid hook face 33 with the front keeper face 2| while maintaining the rear hook face 45 in tight engagement with the rear keeper face 2|. By simply rotating the locking nut 5| to displace it toward and against the ear 48, the mount is locked so that the hook 44 cannot slide relatively to the rod 4| and so that said rod may not be displaced rearwardly through said hook. The nut 5| is shown in a locking position of Figures .1, 2 and 6. It will also be apparent that when the hook 44 is moved relatively'to rod 4| or conversely, that relative movement will occur between the hook 4 and mounting bracket 34' so that the ear 4.8 will slide relatively to the screw 49, assuming that the locking nut 5| is backed off from the ear '48. As previously stated, the cam faces of the hooks cooperate with the inclined keeper faces 2| and with the spring 147 to: displace the mounting brackets 22 and 34 downwardly toward the adaptors I3 and IA to cause the mounting bracket ribs to seatin the'grooves l9 and 20. The side bearing and tip clearance between the ribs 38 and 39 and the grooves l9-and the bottom bearing and side clearance between the ribs 3| and '40 and the grooves 20provide a structure affording maximum stability a-ndalignmerit for the telescopesight as the two ribs which engage the grooves is effectively prevent lateral displacement of the mounting brackets and telescope sight whereas the two ribs which engage the grooves -20 effectively prevent vertical .displacement of said parts.

Variougpmodifications and changes are contemplated and may obviously be resorted to without departing from the spirit or scope of the invention as hereinafter definedxby the appended claims.

We claimas'our invention:

1. A telescope sight mounting for a firearm comprising a pair .of adaptor blocks adapted .to be secured to spaced portions of .a firearm 'in longitudinal alignment, a pair of mounting .braoketsada pted 'to' be detachably clamped to a telescope sightand disposed over .said adaptor blocks and ,in engagement therewith, a first hook fixed to the first one of .saidmountin bracket and engagingunder, an end ,of a first one of said shank-end of thescrew :49v is threadedminto at" adaptor blocks, said hook having a sooke'tgopening outwardly thereof toward the other, second mounting bracket, a rod having one end seated in said socket and having a portion remote to said end extending through said second mounting bracket, means detachably securing the second mounting bracket adjustably to said rod, a second hook slidably mounted on said rod, spring means urging said second hook toward the second mounting bracket and the other second adaptor block for positioning a bill portion of the second hook under a part of said second adaptor block for detachably retaining said mounting brackets in engagement with the adaptor blocks.

2. A telescope sight mounting for a firearm as in claim 1, a threaded member adjustably fixed to and extending from the second mounting bracket toward the first mounting bracket, an apertured ear fixed to and projecting laterally from said second hook and slidably engaging said threaded member for guiding said second hook in sliding movement on the rod.

3. A telescope sight mounting for a firearm as in claim 2, and an adjustable locking stop threadedly engaging said threaded member between said apertured ear and the first mounting bracket for limiting displacement of the second hook away from said second adaptor block and for selectively locking the second hook in engagement with the second adaptor block to prevent detachment of the mounting brackets from the adaptor blocks.

-4. A telescope sight mounting for a, firearm as in claim 1, said adaptor blocks having downwardly and inwardly inclined keeper faces in the undersides of their adjacent ends, and said hooks having downwardly and outwardly inclined upper surfaces disposed in camming engagement with said keeper faces for displacing the mounting brackets toward and into tight engagement with the adaptor blocks when said slidably mounted hook is spring urged away from said first hook.

5. A telescope sight mount for a firearm as in claim 4, said adaptor blocks and mounting brackets having adjacent faces provided with interfitting ribs and grooves disposed parallel to the axis of the firearm and telescope sight.

6. A telescope sight and mount for a firearm as in claim 5, certain of said grooves being of V-shaped cross section and other of said grooves having fiat beds and upwardly and outwardly diverging side walls, certain of said ribs having tight fitting engagement with the side walls of the V-shaped grooves and clearance between the bottoms of said ribs and the beds of the V-shaped grooves, and other of said ribs having bottom surfaces contacting the bottom surfaces of the flat beds of said other grooves and having slight clearance between the side walls of said last mentioned ribs and the upwardly diverging side Walls of said last mentioned grooves.

ROBERT R. HARDGROVE. ERNEST T. LAKE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,450,466 Carlson Oct. 5, 1948 2,510,289 Livermore June 6, 1950 2,526,816 Hardgrove Oct. 24, 1950 

